* On the economic front, clues on the health of the U.S. labor market could come with the release of weekly initial jobless claims at 8:30 a.m. EDT (1230 GMT). Economists forecast a total of 370,000 new filings, compared with 380,000 in the prior week.

* Due at 10 a.m. EDT (1400 GMT) are the Philadelphia Federal Reserve Bank’s April business activity index, the Conference Board’s leading economic indicators for March and existing home sales for March from the National Association of Realtors.